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@moonlightbox(Johnny Chu)

C++ - auto&& vs auto& vs auto

Last updated at Posted at 2018-09-20

C++ is difficult...T_T

  • Choose auto x when you want to work with copies.
  • Choose auto &x when you want to work with original items and may modify them.
  • Choose auto const &x when you want to work with original items and will not modify them.
  • Use auto && is a Universal Reference.

https://stackoverflow.com/questions/29859796/c-auto-vs-auto
https://zhuanlan.zhihu.com/p/25148592

2018/11/06 Updated

I found this and explained very detail.
http://tommyjswu-blog.logdown.com/posts/1766009-c-11-mouth-cannon-universal-reference-rvalue-reference-and-move-semantics

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